@get:JvmName("proxySelector")
  val proxySelector: ProxySelector =
    when {
      // Defer calls to ProxySelector.getDefault() because it can throw a SecurityException.
      builder.proxy != null -> NullProxySelector
      else -> builder.proxySelector ?: ProxySelector.getDefault() ?: NullProxySelector
    }

  @get:JvmName("proxyAuthenticator")
  val proxyAuthenticator: Authenticator =

      synchronized (mutex) {
        return delegate().get(key);
      }
    }

    @Override
    public @Nullable V getOrDefault(@Nullable Object key, @Nullable V defaultValue) {
      synchronized (mutex) {
        return delegate().getOrDefault(key, defaultValue);
      }
    }

    @Override
    public boolean isEmpty() {
      synchronized (mutex) {

        if (cookieSpecRegistry != null) {
            return cookieSpecRegistry;
        }

        final PublicSuffixMatcher publicSuffixMatcher = PublicSuffixMatcherLoader.getDefault();
        final CookieSpecProvider defaultProvider =
                new DefaultCookieSpecProvider(CompatibilityLevel.DEFAULT, publicSuffixMatcher, cookieDatePatterns, false);

                proxy = new Proxy(Type.HTTP, addr);
                if (StringUtil.isNotBlank(getHttpProxyUsername())) {
                    Authenticator.setDefault(new Authenticator() {
                        @Override
                        protected PasswordAuthentication getPasswordAuthentication() {

    }
  }

  @AfterEach fun tearDown() {
//    TODO reenable after https://github.com/square/okhttp/issues/8206
//    fileSystem.checkNoOpenFiles()
    cache.close()

    java.net.Authenticator.setDefault(null)
  }

  @Test
  fun get() {
    server.enqueue(MockResponse(body = "ABCDE"))
    val call = client.newCall(Request(server.url("/foo")))
    val response = call.execute()

  }

  public <T> void testNulls() {
    new NullPointerTester().testAllPublicStaticMethods(TypeToken.class);
    new NullPointerTester()
        .setDefault(TypeParameter.class, new TypeParameter<T>() {})
        .testAllPublicInstanceMethods(TypeToken.of(String.class));
  }

  private static class Assignability<From, To> {

    boolean isAssignable() {